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Uncover the best deals on Seattle to St Louis flights by comparing fares from hundreds of airlines and agencies.
Good to Know: Cheapest and Fastest SEA - STL Flights
Useful information for finding best airline tickets from Seattle Tacoma International to Lambert St Louis International on your next trip.
Cheapest Round Trip Flight
$582
Southwest Airlines
• 1 stop
• 21h 45m
Jul 24 – Jul 31
The cheapest round trip flight from Seattle to St Louis (SEA-STL-SEA) is currently $582
Cheapest One way Flight
$184
Southwest Airlines
• 1 stop
• 10h 5m
Jul 18
The cheapest one way flight from Seattle to St Louis (SEA-STL) is currently $184
Cheapest Direct Flight
$323
Alaska Airlines
• nonstop
• 5h 51m
Jul 31
The cheapest nonstop flight from Seattle to St Louis (SEA-STL) is currently $323
Fastest Flight
5h 50m
The fastest nonstop flight from Seattle to St Louis (SEA-STL) takes 5h 50m
Top Airlines Flying from Seattle to St Louis
Latest Flight Deals from Seattle (SEA) to St Louis (STL)
Compare and book low fare round-trip air tickets from Seattle to St Louis. Ideal for travelers with confirmed return itineraries.
Jul 24 - Jul 31, Economy
Seattle → St Louis
21h 45m
6:30 AM - 9:35 PM • 1 stop
Seattle → St Louis
6h 55m
11:40 AM - 1:55 PM • nonstop
Southwest Airlines
Jul 24 - Jul 31, Economy
Seattle → St Louis
18h 50m
5:15 AM - 6:45 PM • 1 stop
Seattle → St Louis
6h 55m
11:40 AM - 1:55 PM • nonstop
Southwest Airlines
Jul 24 - Jul 31, Economy
Seattle → St Louis
14h 15m
7:50 AM - 6:45 PM • 1 stop
Seattle → St Louis
6h 55m
11:40 AM - 1:55 PM • nonstop
Southwest Airlines
Jul 24 - Jul 31, Economy
Seattle → St Louis
10h
12:20 PM - 8:20 PM • 1 stop
Seattle → St Louis
6h 55m
11:40 AM - 1:55 PM • nonstop
Southwest Airlines
Jul 24 - Jul 31, Economy
Seattle → St Louis
10h 40m
5:30 AM - 2:10 PM • 1 stop
Seattle → St Louis
10h 15m
8:55 AM - 1:10 PM • 1 stop
Southwest Airlines
Explore competitive one-way airfare options for SEA - STL flights. Best suited for flexible or open-ended travel plans.
Flying to St Louis soon? We've surfaced some of the most affordable last-minute flights from Seattle to St Louis, ideal for urgent plans or spontaneous trips.
Looking for the fastest way to St Louis? These direct flight options from SEA to STL offer both convenience and value—no layovers, just straight to your destination.
Jul 31 - Aug 02, Economy
Seattle → St Louis
5h 51m
1:06 PM - 6:57 PM • nonstop
Seattle → St Louis
7h 7m
2:50 PM - 5:17 PM • nonstop
Alaska Airlines
Aug 07 - Aug 09, Economy
Seattle → St Louis
5h 55m
6:04 PM - 11:59 PM • nonstop
Seattle → St Louis
7h 8m
6:02 AM - 8:30 AM • nonstop
American Airlines
Jul 31 - Aug 02, Economy
Seattle → St Louis
5h 50m
9:00 AM - 2:50 PM • nonstop
Seattle → St Louis
6h 55m
12:00 PM - 2:15 PM • nonstop
Southwest Airlines
Jul 24 - Jul 31, Economy
Seattle → St Louis
5h 50m
9:00 AM - 2:50 PM • nonstop
Seattle → St Louis
6h 55m
11:40 AM - 1:55 PM • nonstop
Southwest Airlines
Jul 23 - Jul 30, Economy
Seattle → St Louis
5h 50m
9:00 AM - 2:50 PM • nonstop
Seattle → St Louis
6h 55m
11:40 AM - 1:55 PM • nonstop
Southwest Airlines
FAQs on Seattle to St Louis Flights
What are the airports in Seattle?
SEA
What’s the most popular airline flying from SEA to STL?
The most popular airline flying from Seattle to St Louis are
Can I fly from SEA to STL non-stop?
Yes, you can fly SEA to STL non-stop on
Which airlines fly nonstop between Seattle and St Louis?
The non-stop flights between Seattle and St Louis are .
What’s the earliest departure time from SEA to STL Airport?
The earliest flight leaves SEA at 5:00 am and lands in STL - Lambert St Louis International
What are the airports in St Louis?
STL
Can I make changes to my Seattle to St Louis flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from SEA to STL?
Read the fare rules of the Seattle to St Louis air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Seattle and St Louis?
operate flights between Seattle and St Louis
How long does a flight from Seattle to St Louis take?
It takes approximately 4 hour to fly non-stop from SEA to STL, which is 1709.07 miles by air.
Which airlines provide the cheapest flights from Seattle (SEA) to St Louis (STL) ?
In the past couple of days, the cheapest tickets to STL from SEA were found on WN : USD 381
Do I need a passport to fly between SEA and STL?
No
What’s the latest departure time from SEA to STL ?
The last flight leaves SEA at 11:15 pm
Seattle (SEA) to St Louis (STL): Airport Information
| Origin Airport | Seattle Tacoma International , Seattle, US |
| Destination Airport | Lambert St Louis International , St Louis, US |
| Distance | 1709 miles |
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